Fluid-pressure-brake device



Oct. 2, 1923. 13469585 J. c. MOCUNE v I FLUID PRESSURE BRAKE DEVICE Filed 001:. 4. 1921 INVENTOR JOSEPH O.Mc CUNE ATTORNEY flatet 808 C. McCUNE, 01E 2:: E1; Q1. 3..

SYLVAL. y

GE, N JERSEY, ASSIGNOB TO THE WESTINGHGUSE .1. I i F comm, F WILMERDING, PENNSYLVANIA, A CORPORATION OF FLUID-PRESSUBE-ERE DEVICE.

Application filed center. a, 1921. Serial no. 505,. f

To all wiwm itmay comm ii it own that I, Josarnr C. MOCUNE, a citizen of the United States, residin at Grange, in the county of Essex and tate 3 of New Jersey, have invented new and useful Improvements in Fluid-Pressure-Brake Devices, of which the following is a specification.

This invention relates to fluid pressure an brakes and the principal object of the invention is to provide means for preventing loss of the brakes through failure of the fluid presure supply by reason of ru ture of the main reservoir or breakage o the 35 main reservoir pipe.

In the accompanying drawing, the single figure is a diagrammatic view, partly in section, of an apparatus for supplying fluid under pressure to the brake system and em- 29 bodyin my invention.

As own in the drawing, the apparatus includes a fluid compressor 1 and main reservoirs 2 and 3, from which fluid under ressure is supplied to the usual feed valve evice 4.

As is usual on a locomotive fluid pressure brake uipment, two main reservoirs are emplo :d, which have. heretofore been connect to act as a single reservoir, and should the main reservoir pipe break, fluid ressure for operating the brakes would be est and therefore the brakes could not be ap lied.

ccording to my invention, means are rovided so that fluid under pressure may supplied from either reservoir and if the mam reservoir pipe to one reservoir should break, this reservoir will be cut ofi and fluid under pressure will be supplied from the other reservoir to the feed valve device for controlling the brakes.

Fluid compressed by the compressor 1 is supplied through a pipe 5 tothe reservoirs 2 and 3 but interposed between pipe 5 and pipe 6, leading to the reservoir 3, is a valve device 7 comprising a casing containing a valve piston 8, subject on one side to the pressure of a coil spring 13, for controlling communication from pipe 5 to pipe 6. A double check valve device 9 is also provided which comprises a casing containing a double check valve 10, having one side of the check valve connected to the supply pipe 11 from the reservoir 2 and the other side to the supply pipe 12 of the reservoir 3. At an intermediate point, the valve chamber 14 is connected to pipe 15, leading to the feed valve device 4.

In operation, if there is no fluid pressure in the system, the compressor 1 operates to compress fluid into the reservoir 2 and at first, since there is no pressure in the reservoir 3, the double check valve 10 will be shifted to the left against the pressure of the 0011 spring 16, so that communication between the suppl pipe 11 of the reservoir 2 and the feed va ve pipe 15 is established, while the supply pipe 12 of the reservoir 3 is cut ofl. Fluid under pressure from the reservoir 2 is therefore available for brakingvpurposes.

en the pressure in reservoir 2 has been lncreased to a predetermined degree, the valve piston 8 will be lifted from its seat against the pressure of spring 13, so that fluid under pressure will now be su plied to reservoir 3, past the check valve 1 and through pipe 6. Upon substantial equalization of fluid pressure upon opposite sides of the double check valve 10, the spring 16 will shift the double check valve to the right, as shown in the drawing, so that fluid under pressure will now be supplied from the reservoir 3 through pipe 12 to the feed valve &pipe 15, while the supply pipe 11 is cut 0 If the supply pipe 12 should break, the pressure will be reduced at the left of the double check valve 10 and the higher pressure supplied through pipe 11 will effect the shifting of the double check valve 10 to the left, cutting ofl communication from the broken supply pipe 12 and opening communication from the supply pipe 11 to the feed valve pipe 15, so that fluid under pressure is now supplied from the reservoir 2 for controllingthe brakes, thus preventing loss of the brakes, by the breakage of the su plly pipe 12..

e drop in pressure in the reservoir 3 due to the broken supply pi 12, causes a reduction in pressure below t 1e valve piston 8 and when the pressure has dropped to a predetermined degree, for example, pounds, the valve piston will be shifted to its lower seat, thus cutting off communication from the pipe 5 to the reservoir 3.

If the supply pipe 11 should break, the

' voir 3 through the supply pipe 12as is nordouble check valve 10 normally closing communlcation from the supply pipe 111, fluid under pressure is supplied from the resermally the case.

Loss of pressure from the reservoir 3 is prevented by the check valve 17, as well as by the closing of the valve piston 8, when the pressure in the reservoir 2 is reduced through breakage of the pipe ill,

Having now described my invention, what T claim as new and desire-to secure by Letters Patent, is

]l. The combination with two main res ervoirs normally charged with fluid under pressure, of a valve device for controlling communication from said reservoirs through which fluid under pressure is sup.- plied for. controlling the brakes and operated upon a reduction in pressure 'in one reservoir for closing the supply communication from said reservoir and for establishing the supply communication from the other reservoir. I

2. The combination with two main reservoirs normally charged with fluid under pressure, of a valve device normally providing a communication for supplying fluid from one reservoirand operated upon a reduction in pressure in said reservoir for cutting fl said communication and for establishing communication for supplying fluid from the other reservoir.

3. The combination with two main reservoirs normally charged with fluid underpressure, of a double check valve subject.

to the opposing pressures of said reservoirs for controlling i counication through which fluid under pressure is supplied for controlling the brakes.

t. The combination with two main reservoirs normally charged with fluid under pressure, of adouble check valve subject on one sideto the pressure of one reservoir and a spring and on the opposite side to the pressure of the other. reservoir for cohtroleas es ling communication through which fluid under pressure is supplied for controlling the brakes.

5,, The combination with a main reservoir of a valve device operated upon a predetermined reduction in pressure in mid reservoir for cutting ofll communication.

through which said reservoir is. charged with fluid under pressure.

6. The combination with a main reservoir, of a valve device subject to the pressure of fluid supplied to said reservoir and operated upon a predetermined reduction iuthe fluid pressure for cutting ofli communication through which said reservoir is charged. 1 i

7. The combination with two main reservoirs normally chared with fluid under upon a reduction in pressure in one reservoir for cutting ofl' counication through which fluid under pressure is supplied from said reservoir and for opening communication through which fluid under pressure is supplied from the other reservoir and a valve piston normally providing uunication through which the first mentioned reservoir is char ed with fluid under pressure and operate upon a predetermined reduction in pressure in said reservoir for outtin old said communication.

n testimony whereof T have hereuntoset my hand, W

" Jos'nrn o. mourn. 

